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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '29f91dfb92ce706e944856b487fa230b672236a7af5172cf3053f1ecc3e2ce68' 
  AND token = 'gcuLibylqy5K4LeWQ1bVVm7/c5wmR5Bs/rtCsFrc+8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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