Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e1cf1614e422ceaaf01bef7e9ff2cb15266ba633d488ce5d13e66c6abc5b9b' 
  AND token = 'n9Si/5Zq6R+6BW4IUzC6Drgus0zFg/9yaDFB8ibD6t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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