Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3e86193b3b17318c8d927d8dc6fb25db8cf39bc474e3d8611ff3fc935ae8a5' 
  AND token = 'FevyszMwfQhkup0RW2MWxEbyBInbTIB/SsRNtuwjlhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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