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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '66b8f86303952f99cdb823eb019e84996662aa700036914dfbdf88e3b023e611' 
  AND token = 'eRXbkV9hKEm0G5fsVL6KLwaFF0R5hKieIVTMvOHog4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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