SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '89830c49fee6256e1750dfd1c9f42a0578fe9dc68158d4b73bb6e8962628a067' 
  AND token = 'dTSZv1sLtJ0BwqhNeYOQ4Eksb11AOQyx9gdvgP2af9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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