Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03af2bd7e546681711233ac087bbaa37b07c0253f5bb6561a68203083a31ce1e' 
  AND token = 'bU1yGEsF0Hn8Odxz/+WuXp+F1zb6ZiDcuFdMxzpT1k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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