Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dd8d7c8f0d04dd3de413d52feea4f7275c8d709f6740cc17e872669a6b570c' 
  AND token = 'YKIrwDi8D1q2Ucnrz6VrjJ+htNzx4IcxKpHFLWvMAqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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