Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a18a2c0c6e2d4f00cfb7aa8f88b018ac8ab7220f511ef19e91195e4262c24e' 
  AND token = '/cCCKUS4fXzrUodWeVtrw/BVSR1+xyZfBBU+LP64WeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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