Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ce1284a4c1a5659d30a1011cb8abfef6381a7c04611b8fdde7af56236aacef' 
  AND token = 'MatKD9475kdIo6F+JFtxg1vT2jKbHgfqppyXos5SwWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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