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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd96148d64d5e21ecf86dccdb0d8d5a3e5ae009f5f1abc2131b12b56feeb55a02' 
  AND token = '3UUh9nzpC0beI7WDoI31j1RupQBdTb1UUlw7qR1deUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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