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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '354b7cf4635a60ce3514c9bdfc2cc47f73ad3b2b1200893c08ef770d714336ee' 
  AND token = 'ss5kxHqTOZskENDDLweYfYeN3BjoStQvkrSs1xkVZ5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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