Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294404d7b1006cfa6247852e54a80d744f9923856b67f572c3054b836aaa1f8c' 
  AND token = 'IKGI49u8Ib/mRjaH7k8BWS1nsSpabM4niF9QPMgVdVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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