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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aa274032c254a6656a14d9fdfad9d395d7885e3d668b618a2c8c6c86131082e7' 
  AND token = 'tmZX+ZBudID5BnRmPo2yGRuFKbqF6kj9HUhBQEd9AIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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