SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '64566dc92781aa4c0e3530b2a2e48520365041d799c4bb6889bdb11ca40e5e4c' 
  AND token = 'uYCnvqjnGBVLDjDTZhyRwTzldj9t6/wl47dbPeLe0dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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