Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54095ebc384c3636ce4f455b5881cd440c66af20f84eaeb8972d2fa048b000c' 
  AND token = 'MHvoFLQt1+inSb6sGQ7dIC5QXxfXEgU7S0FZv2Vm+Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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