Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1efe1c6ea207cb617828354ceba42fcdccd3a157dbfe81046b1c1072a6914c1' 
  AND token = '0tCt/Hu2WX6agEolAKr8Rm3BLZxXNJEZ3cA6g4FDgEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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