Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b58ea43cd349a2bb0515bec4722406bc00f21267cb910d5341932139c72a30' 
  AND token = 'cvlJdwjIzRj1XHB0dmqCD2G47WUNsfqZ0crpBCeN8Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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