Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7de638e93da38369e45e0b4188630c16752254073c152d0a772f81dcaee383' 
  AND token = '53yYeTG2YuBPwxVkZfyr0wWad0q9dgqp2c/2tnoEH6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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