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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a56ffad65a7738be14144f996252b7ba4687af1a939862aa55e3fee0a5497618' 
  AND token = 'UEv2a6JHxPf02TFAtxjGvR9NdZQ+N4aKdCBYHvfrlbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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