Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26b1d5a80282d8de9d785c940690f7c3daa10b7eb86cd424c1c9f2218944ca6' 
  AND token = 'w0jz3ztAYxGJJ2+kB47eGWSbkeQK3KqNkvpOAAnmU6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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