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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bea189169f5616754e61af6152ffa20edf1428fca683df0421fee2d10c21eb6b' 
  AND token = 'l/FIxnLk5paFWtrPUhsFB2O2EuyLEUZZGQ/2ynNZoxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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