Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2878df0e171cd24b8df3e98810b1e8d5b7da2aeac01db8cdf68d93e3d20098a' 
  AND token = 'pqlfSxi0U4alLN+hmM7bULHhfECMTYVV/+V3VuTfu0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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