Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6937477abaa0bbe08701132d1ecc2f449c5d2f74ec2bbda5cfd791dbb0f7b20f' 
  AND token = '/G49ku2lz6RbcobcUQaKGqGBxMn80jpK2ySt81iyJ2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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