Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9f20c47f09b39fb73aebe465542ce3494668462014474733bae85ce9731db5' 
  AND token = 'L9v1fAgd4Bt+5alyRk8AXyKRs/VRA2EDgxci2njNXaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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