SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0dde6e53764cd482a4461bf154c05832edc446fbdcf759dc20c909a5ac52e134' 
  AND token = 'wSvp3b+VvFinxhCdyaJsaL5fEiZ4G+fXQRgj1ZOnItw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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