Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574c96c0a2d5efb4eac8eaddc7503f4faf94ee5114af216c80905321887e5b92' 
  AND token = '8qqTdWpua6nOPqwPaldQh36po0kwwbElyUXas6q+6ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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