Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ac590616d6c8794ff11f766fb6790a4f2e1e70a1788cbd66db914aa5be045f' 
  AND token = 'a3D6Zj7+1qmmIlu0XGSsfLE+bd7L+Reb2CEXcQjtCL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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