Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39604d1b0eaed48fddb6229188a542cd953ee8cafa3e4d0e42e4ee57f3be3945' 
  AND token = 'kI/HarKp2k/ZLDkDktezvUd33zWgolyMlv/TsbVeZ4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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