SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba1b98ddfd823be5c5d163bb842ef89e224619bc968e4ea2e9c48b097771f6b0' 
  AND token = '+316hBwnx733jfI55nFEwvlY8fbJ+YM5KE2DNwMGso4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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