Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0209f8361d476651785f301e47473f07130c06f54de838a0a2fd4aaeff6a56a' 
  AND token = 'zfHUUuyR0hpS5fycdbHtb5AG4SRoZxvoeqoyPnaoTGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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