Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6beb100148e453a70b707a1221c97c8cc69ce8cf64568bc9688d5cdd3d14070a' 
  AND token = 'FOPmR3+i9AteDP0WFhz3fgt5px6dH/mOS2pwrU6OgZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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