Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1e8ecbd320078ed6d47e40d0feddb4b37f91844e99fc1f9b338ac5ed79c18c' 
  AND token = 'yNghfUR8uTP3HEsOZ6LGAy5v7JmcOcKUsFnc2JEJC/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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