Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236461f261794eb3d0b1e08778c8690bd5889046eef46f05dfa7119351a4d748' 
  AND token = 'Sx9OWhiU4QekDpriaCS1sl0+lkOdb/pNLt2qozaHJpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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