Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1568f16370c442157078ef7daa94d0b00a1853e0446f2d08e25ae9010602dc04' 
  AND token = '2a4Fja72B0wcngpbfQVcicfREVJNc3I7SHQK1a0JSTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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