Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552b3d015ceeb90dd510193ff72086465f6a77ce580ecc528296881e396ddf6d' 
  AND token = '7mT8pPhzTwtfLRee4DzDH8lsn+yTOG3QN38N0mVd+t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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