Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59830545307bb3e3118fcbcdb8224610a83da1c147a25fcd4b98970aa309d99' 
  AND token = 'J7EQH+Bz7AGDfN4ldbs+VNj9VsatwuYdmtDS+bjFUr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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