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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2170b67df7ca9e33e70219dee8cf4eaa836754d2766e6a4c3e497e036952c596' 
  AND token = 'PS0VVoyKCXYs09++Ai6VPectK5wKQqxE3xqmUYvVyDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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