Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148163ddd3f351fb091144bc7e5006c304b65194d1516c13e3802beb557830ba' 
  AND token = '2wtdaoaM+rEn+VLPYvT3hFfCgL6HWaVVFVFIMrQVuVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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