Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ad5d2dbc17c2631c3ca526ee0cb587af4554f6e40d24201a9e76942872c8ac' 
  AND token = 'tHxEVhaLsivtkPlOD7OOqRfRekHShvp83N/0nSuiWRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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