Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402be8632fa3f6dc8690e52cefb8e8df605c9f04fd04aca14d34afe1c3eca6ee' 
  AND token = '/3JYAlNJAfZw/nHKCDzvYwdfLktXNvyIde/2g1H0mH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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