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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '34360e922d4db68df3f4fd57ace0844a96deb50fa53b63d6a855e2cc30060fdd' 
  AND token = 'X4krhyw+JNZwXv0xmFa2hHaBQZT+9k4X4WhQonZ2dXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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