Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5711dfa5ccf4aff13167fd1a4d0f21790a410c69de1713076a93c23a021a4ca0' 
  AND token = '/38UQ9ikNm6ciDwxJc3Ksz03cGUsGDzWNzahSTSbIVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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