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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3e954795e567e199c6cfbee461d9a451683da8d73bb9d17c5704963b884ec14d' 
  AND token = '+4lROfoY9FojllFqr09ONgxTPlXZ839sJ4yK2jNli94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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