SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '723409b7f3ce066ce89948f3f0d3b8b7126fd800092943ea7b54a4ec6d59b3ff' 
  AND token = 'io8ymA80r+VCnpwzBgpBiSugw2NP1/hbI8m4dsjEX+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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