SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2632cb258376d73990e7991ebbe4eeefeb0887902d0e2c9104a70e6df5dee548' 
  AND token = 'ROgAYBWPMnlIwhg+P5J93T3Qn8zWVDrDxqJXFXqdsj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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