Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c987d6f962e6e299bf3c21e10b386a74c04e637174ebcae9b5b5afd1360cb525' 
  AND token = 'a/ELvQaosSWf9mPmBnifd1CrJjXfiebILMPx9CEOWJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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