Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c3b7ac796bc3625e9fab8045ea2c2890223732701b088b9d78a1591202b4e1d1' 
  AND token = 'Wz4HU+3hdKlNa53BMfx8uLAULjr2/EcOL8eQgWMSC94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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