Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a834e8a30f4a801cc0b3636fbfa5e0f784e89e0640a35e8f3a298981ae0a0e3' 
  AND token = '4pQ9/Dg8+X6s4q3wwD8SPLUFDq57hGg+tJ64nxCCIVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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