Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503f8bc4fe234dbafa0e0f447f43a04fe892fa09ac6052eab6f94b60eff25722' 
  AND token = 'WGCiqNxk+hPHMLvKBjPpOvSdSnYmU1goqrLHWQysmNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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