Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5c2321509096292b7346e181fe9168da7456b3b9fbcb2bd6d94314bea16aa3' 
  AND token = 'ftTPjmfKjAv7GUFAL4iEW04TAQTC2EvACFhg3PQx8eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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