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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '84dffdd9e68d725d082fc9445a8baa0d018905fabf4d2d6bda89d4f4c0b3b42c' 
  AND token = 'mF0wpzpAXtZ+51u5Ea/KseZCPq10N0Aq6RqN62Mzzy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}