Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a33cd26d7099772ced20d431a1d9accb3edf9f39b82421c75cf38d44a21cc52' 
  AND token = 'K8PLC1tuHzhvm1R78dhBpfQJOl5BJO2lNWbVA9YU0J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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