SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '397f7eb711586fdd9bfe2a705eb51e607040b34314bbc470343d027b751b3647' 
  AND token = 'SO/5iChOfXPmKX0+qlZEMzp+pppzHfuEPNIJLTG/HuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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