Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af573b34cd9866275c76a8a0c3079a978da39b32b0505046b6c8ef5dca994352' 
  AND token = 'LJDq2DA6BESFFaQnPK9WGySDrG9f8risnlmjzzXFvqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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