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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '83f2084d90b44b06acc55824535dbaab6c1a208a4fcee1ebdbe09cf5d64d9fb6' 
  AND token = 'xXNOzPDdVsM07gLbboZpqCMmBIDxQJd6zvyxakxBb9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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