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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3ce7f326b3ee321c7574d9a76c456a4cf0402002e41b207534c43ab580f1711e' 
  AND token = '2CpPvGW5C56/5OC5Fnh0kEd4SQmzfCQAjCWh2cngQOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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