Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4168dd21f23641b3555762278bd2e0770cf7254740425b08eb7be6bb634eb8a' 
  AND token = '5+DE7hu3LPBx3HMxW/Wl/sXHa1IAMGgxlYAgC3W/n20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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